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1、模态分析的发展与分类（Developmentandclassificationofmodalanalysis）Thedevelopmentandclassificationofmodalanalysis.Txtdonotgiveuponyourself!(momoncesaidtome,themomentIturnedroundtogoout,Iburstintotearsanddidn'twantanyonetoseeit!)Toseethisonesmallheartfeeling,thinkofwhenIlefthometotho
2、usandsofmilesaway,mymotheralsosaidsomethingsimilar,butasaman,youmustcreateaday,inordertorepaytheirparents!!Modalanalysiscanbedividedintocomputationalmodalandexperimentalmodalanalysis,andtheirstructuraldynamiccharacteristicsarecharacterizedbymodalparameters.Inmathematics,
3、themodalparametersarethecharacteristicsofdifferentialequationsofmotionformechanicalsystemsandthefeaturevectors,namelytoknowthestructuralgeometry,boundaryconditionsandmaterialproperties,thestructureofthemassdistribution,distributionofstiffnessanddampingdistributionrespect
4、ivelywithmassmatrix,stiffnessmatrixanddampingmatrixisexpressed,itisenoughinformationtodeterminethemodalparameters(naturalfrequency,dampingratioandvibrationmode).Itisprovedthatthesemodalparameterscandescribethedynamiccharacteristicsofthesystemcompletely.Experimentally,its
5、tartswithmeasuringthedynamicinputforceandtheoutputresponseofsomepointsonthestructure,andgenerallyconvertsthemeasureddataintofrequencyresponsefunctions.Itisprovedtheoreticallythatthesefrequencyresponsefunctionscanberepresentedbymodalparameters.Therefore,thesecondstepofthe
6、experimentalmodalanalysisistoestimatethemodalparametersfromthemeasuredfrequencyresponsefunctions.Modalanalysisisasynthesisofseveralengineeringdisciplines,includingstructuraldynamicstheory,digitalsignalprocessing,systemidentificationandtestingtechnology.Withthedevelopment
7、ofspecialtopicsinmodalanalysis,modalanalysistechniquehasbeengeneralizedintermsofsystemidentification,structuralsensitivityanalysis,anddynamicmodificationThesolutionincludesthedeterminationofthedynamiccharacteristicsofthemechanicalsystemandmostoftheareasrelatedtoitsapplic
8、ation.Inthischapter,thebasictheoryofmodalanalysisisbrieflyintroducedfromtwopointsofview:modalanalysisan
